Download Carrier 38HDA Specifications

TROUBLESHOOTING (TROWEL)
TABLE 4. TROUBLESHOOTING (TROWEL)
SYMPTOM
Engine running rough or not at
all.
Safety kill switch not functioning.
If trowel “bounces, rolls
concrete, or makes uneven
swirls in concrete”.
Machine has a perceptible
rolling motion while running.
POSSIBLE PROBLEM
SOLUTION
Kill switch malfunction?
Make sure that the kill switch is ON or replace switch if
necessary.
Fuel?
Look at the fuel system. Make sure there is fuel being supplied to
the engine. Check to ensure that the fuel filter is not clogged.
Ignition?
Check to ensure that the ignition switch has power and is
functioning correctly.
Other problems?
Consult engine manufacturer’s manual.
Loose wire connections?
Check wiring. Replace as necessary.
Bad contacts?
Replace switch.
Blades?
Make cer tain blades are in good condition, not excessively worn.
Finish blades should measure no less than 2" (50mm) from the
blade bar to the trailing edge, combo blades should measure no
less that 3.5" (89mm). Trailing edge of blade should be straight
and parallel to the blade bar.
Spider?
Check that all blades are set at the same pitch angle as
measured at the spider. A field adjustment tool is available for
height adjustment of the trowel arms (see Optional Equipment).
Bent trowel arms?
Check the spider assembly for bent trowel arms. If one of the
arms is even slightly bent, replace it immediately.
Trowel arm bushings?
Check the trowel arm bushings for tightness. This can be done by
moving the trowel arms up and down. If there is more than 1/8"
(3.2 mm) of travel at the tip of the arm, the bushings should be
replaced. All bushings should be replaced at the same time.
Thrust collar?
Check the flatness of the thrust collar by rotating it on the spider.
If it varies by more than 0.02" (0.5 mm) replace the thrust collar.
Thrust collar bushing?
Check the thrust collar by rocking it on the spider. If it can tilt
more than 3/32" (2.4 mm) [as measured at the thrust collar O.D.],
replace the bushing in the thrust collar.
Thrust bearing worn?
Check the thrust bearing to see that it is spinning free. Note:
Thrust cap, replace if necessary.
Main shaft?
The main output shaft of the gearbox assembly should be
checked for straightness. The main shaft must run straight and
cannot be more than 0.003" (0.08 mm) out of round at the spider
attachment point.
Yoke?
Check to make sure that both fingers of the yoke press evenly on
the wear cap. Replace yoke as necessary.
Blade Pitch?
Check to ensure that each blade is adjusted to have the same
pitch as all other blades. Adjust per maintenance section in
manual.
HDA-SERIES WALK-BEHIND TROWEL — OPERATION AND PARTS MANUAL — REV. #9 (07/02/10) — PAGE 35